albaka has said that he doesn't want to add ores with just a few uses.
instead I recomend a process of combining iron dust+tin dust=aluminum*
1iron dust+2tin dust=1aluminum dust (smelt for ingots)
*it may not work in real life but... its minecraft dude, did you lost your reality and found it in a video game?
that wouldn't be a bad idea.
IC doesn't need an extra ore and in that way we can keep our worlds if it ever gets implanted.